Horton

Re: Should AT TIME ZONE be volatile?

Tom Lane <tgl@sss.pgh.pa.us>

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Laurenz Albe <laurenz.albe@cybertec.at>
Cc: Robert Haas <robertmhaas@gmail.com>, Shay Rojansky <roji@roji.org>, "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>
Date: 2021-11-11T17:07:36Z
Lists: pgsql-hackers

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  1. Revert per-index collation version tracking feature.

Laurenz Albe <laurenz.albe@cybertec.at> writes:
> On Thu, 2021-11-11 at 09:52 -0500, Tom Lane wrote:
>> Yup.  If we had reliable ways to detect changes in this sort of
>> environment-supplied data, maybe we could do something about it
>> (a la the work that's been happening on attaching collation versions
>> to indexes).  But personally I can't summon the motivation to work
>> on that, when ICU is the *only* such infrastructure that offers
>> readily program-readable versioning.

> Nobody will want to hear that, but the only really good solution would
> be for PostgreSQL to have its own built-in collations.

And our own tzdb too?  Maybe an outfit like Oracle has the resources
and will to maintain their own copies of such data, but I can't see
us wanting to do it.

tzdb has an additional problem, which is that not updating is not an
option: if you're affected by a DST law change, you want that update,
and you frequently need it yesterday.  We're definitely not set up
to handle that sort of update process, which is why we recommend
--with-system-tzdata.

			regards, tom lane